JP2559669Y2 - Gas generator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas generator used in an airbag device for protecting a vehicle occupant.

[0002]

2. Description of the Related Art A specific example of a gas generator used in a conventional airbag apparatus will be described with reference to FIGS. FIG.
6 is a longitudinal sectional view of the gas generator, and FIG. 6 is a partially enlarged view of a portion A in FIG. In FIG. 5, the gas generator 1 is of a so-called package type. The gas generator 1 is a cylindrical container 2 in which an upper container 3 and a lower container 4 are integrated by friction welding 5 or the like. The cylindrical container 2 is partitioned into the outer peripheral portion 23 and the central portion 24 in the positive wall 6, the gas generating agent 12 in each chamber partitioned by an inner wall 7 in the outer peripheral portion 23 and the gas filter 13, 14, 15
Is arranged. In the central portion 24, the transfer agent 16 accommodated in a container 16a made of aluminum or the like is disposed above, and the center disk 19 is inserted from below the lower portion thereof, and is locked to the positive wall 6 by mechanical engaging means 56. Have been.
A squib 18 is attached to the center disk 19 by a squib holder 17.
An acceleration sensor 20 and the like are housed in a space below 9, and are fixed by a cap 21. In FIG. 6, the squib 18 is such that a sheath 48 is arranged along the inner surface of a tube 26, an igniting agent 42 and a heater 43 are loaded inside the sheath 48, and these are sealed with an embolus 44. A broken portion (notch) 27 is provided on the upper surface 26a of the tubular body.
Is provided. The shape of the broken portion 27 is usually a cross. The squib 18 and the transfer charge 16 constitute an ignition section.

In FIGS. 5 and 6, an acceleration sensor 20 is shown.
When a collision is detected, the heater 43 of the squib 18 is energized and heated by a power supply (not shown) to ignite the igniting agent 42.
Is broken and a flame gushes, and the flame reaches the charge 16 through the communication hole 28, and the charge 16 is ignited. Hot air ignited transfer charge 16 through the communication hole 8 provided in the positive wall 6 enters the gas generating chamber 12a gas generating agent 12 generates a large amount of gas is gasified, the gas is Ya inner wall 7 Gas holes 9, 10, 22, 11 provided in the outer wall and each gas filter 1
The air bag is supplied to an airbag (not shown) by sequentially passing through 3, 14, and 15 as indicated by an arrow 25.

[0004]

By the way, an airbag device in which the above-mentioned gas generator is incorporated and used is inflated at the time of a vehicle collision and serves as a cushioning material between an occupant and a steering wheel. Accuracy is required for the operation timing. For this reason, the accuracy of the operation of the gas generator is also required. The gas generator described above has no particular problem in this point as it is. However, from the viewpoint of further improvement, as shown in FIG.
However, there is a problem in that when the transfer charge 16 is ignited after energizing and firing, the transfer charge container 16a such as an aluminum foil must be destroyed by a flame or blast due to the ignition.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a gas generator which can make the ignition time for a transfer charge more accurate. Is to provide.

[0006]

According to the present invention for solving the above-mentioned problems, a cylindrical container (2) is radially partitioned by a partition (6) , and a gas generating agent (12) and a filter ( 1
3 to 15) and charge the explosive (16) above the central part.
Squib attached to the squib holder thereunder (3
In 0) comprising comprises a gas generator (1), said disk
Opening from the upper surface (41a) of Eve to the transfer charge (16)
An annular member (32) having an abutment with the upper surface of the squib.
Placed on the top of the squib and destroyed when the squib ignites.
A ring-shaped broken portion (45) is formed . This squib holder extends downward from above.
And a squib (30) in the hole.
The squib has a spacer and seal on the lower surface.
Material (33), the upper surface of which is the hole (31a)
By the annular member (32) press-fitted into the inside
What is held and integrated with the gas generator body (55)
Cylindrical copper portion extending towards the inner to be formed and the (52c),
An annular portion having an opening (52a) formed at the tip thereof
Material part (52b) and the squib holder.
An annular member integrally formed with the squib;
So that the upper surface thereof contacts the annular member (52b).
Into the cylindrical body (52c) of the squib holder.
Some are worn. Further, the squib is a tubular body.
(41) and a tubular sheath (4
8) and an ignition charge (42) filled in the sheath.
And a ring-shaped destruction portion (4) on the upper surface of the squib.
5) The diameter is smaller than the inner diameter of the sheath (48).
The opening (32a, 52a) of the annular member is provided in the sheath (4).
Some of them have a larger diameter than the inner diameter of 8).

[0007]

The ring-shaped destruction portion formed on the upper surface of the squib is broken when the squib is ignited, and the central disk portion (rupture disk) is blown off to collide with a transfer charge container made of aluminum foil or the like. Will surely be destroyed. At this time, if an annular member having an opening only in the ring-shaped broken portion is provided on the upper surface of the squib, even if a portion other than the opening portion on the upper surface of the squib attempts to swell upward due to internal pressure, the annular member causes the annular member. As a result, the pressure does not escape, and the rupture disc is more strongly and reliably blown. As a result, ignition of the transfer charge is reliably performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the gas generator of the present invention,
2 is a partially enlarged view of a portion B in FIG. 1, FIG. 3 is a view as viewed in a direction indicated by an arrow C in FIG. 2, and FIG. 4 is a view showing another embodiment of the restraining member. In FIGS. 1 and 2, parts having the same functions as those in FIGS. 5 and 6 are denoted by the same reference numerals, and the description thereof will be omitted.

1 differs from FIG. 5 in that a forged squib holder 31 in which a center disk and a squib holder are integrated is replaced by a forged squib holder 31 below the transfer agent 16 in place of the center disk and the squib holder of FIG. the provided throughout the inner diameter of the central portion 24, the squib 30 is inserted into the hole 31a extending downward from the top surface provided in the squib holder 31, the spacer and the sealing material 33 and the ring
The point is that it is attached together with the shape member 32. This part will be described in more detail with reference to FIG. In FIG. 2, the squib 30 is provided with a hole 31 a of the squib holder 31.
The annular member 32 having an opening 32a extending from the upper surface 41a of the squib to the transfer agent 16 is attached to the upper surface 41a while the lower surface is held on a ring-shaped spacer / seal member 33 made of an elastic member such as fire-resistant silicon rubber. , And is caulked around the hole 31a while being pressed down entirely (34) and fixed at a predetermined position.

As described above, it is possible to reduce the cost by integrating the center disk and the squib holder and forming a simple fixing structure in which the squib 30 is fitted and inserted from above. Further, by holding the squib 30 on the spacer / sealant 33 having elasticity, the squib 30 is ignited when the ignition agent 42 or the transfer agent 16 is ignited.
It absorbs the reaction force (approximately 100 kg) applied to the squib 30, prevents the squib 30 from being damaged, and effectively prevents gas leakage and ignition of the squib 30.

In FIG. 2, the opening 32a is provided along the sheath 48 at a position slightly outside the inner diameter of the tubular sheath 48 inside the squib, and the upper surface 41a of the squib located at the opening 32a has a ring. A broken portion 45 is provided along the inner diameter of the sheath 48. This is because the internal pressure at the time of firing of the squib 30 is easily applied to the destruction portion 45. In FIG. 3, this broken portion 45 is circular. Here, the broken portion 45 may be closed, and may be, for example, an ellipse or a polygon. Also,
The shape of the opening 32a of the annular member 32 is the upper surface 41a of the squib.
May be slightly larger than the ring-shaped broken portion 45, and may be, for example, a circle, an ellipse, or a polygon.

Next, the operation will be described. In FIG. 2, when the heater 43 of the squib 30 is energized and heated to ignite the igniting agent 42 and the inside of the tube 41 reaches a certain pressure, the ring-shaped broken portion 45 is broken, and the rupture disk 41b is drawn as indicated by a dotted line. It collides with and destroys the transfer charge container 16a. Here, the annular member 32 prevents the portion 41c other than the opening portion on the upper surface of the squib from expanding upward due to the internal pressure, so that the pressure does not escape, and the rupture disk 41b does not escape.
Is more strongly and reliably blown. As a result, transfer charge 1
6 is reliably fired by the flame.

FIG. 4 shows another embodiment of the annular member. FIG.
Formed the squib holder and the annular member integrally
For example , the squib 30 is held at its lower surface by a squib retainer 46 (56) which is swaged by a gas generator main body 55 or the like, and the squib holder 52 is
Is it Do <br/> from the annular member portion 52b and the cylindrical barrel portion 52c having a 2a. With such a configuration, even common type of gas generator not Batch-mounted have a mounted acceleration sensor can be applied to the present invention.

[0014]

[Effects of the Invention] As described above, the gas generator of the present invention
Since the annular member having an opening facing the squib and facing the transfer charge and the rupture disk provided on the upper surface of the squib of the opening, the rupture disk can be released without escaping the pressure in the squib when the squib fires. It is blown off and collides with a charge transfer container made of aluminum foil or the like, and destroys the container. For this reason, the ignition of the transfer charge is reliably performed, so that the ignition time of the transfer charge can be made more accurate,
It is possible to operate the airbag device at more accurate timing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the gas generator of the present invention.

FIG. 2 is a partially enlarged view of a portion B in FIG. 1;

FIG. 3 is a view taken in the direction of arrow C in FIG. 2;

FIG. 4 is a view showing another embodiment of the restraining member according to the present invention.

FIG. 5 is a longitudinal sectional view of a conventional gas generator.

FIG. 6 is a partially enlarged view of a portion A in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas generator 2 Cylindrical container 12 Gas generating agent 13 Filter 14 Filter 15 Filter 16 Transfer agent 23 Outer peripheral part 24 Central part 30 Squib31 squib holder  32RingMember 32a Opening33 Spacer and sealing material 41 tube  41a Squib upper surface 45 Destruction part48 sheath 52 squib holder 52a opening 52b annular member 52c cylindrical body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyoshi Miyake 3903-39 Tomicho, Tomimachi, Himeji-shi, Hyogo Nippon Kayaku Co., Ltd. Inside the Himeji Plant (56) References Really open Showa 64-56349 (JP, U) Really open Hei 4-60754 (JP, U)

Claims (4)

(57) [Scope of request for utility model registration] The inside of a cylindrical container (2) is radially partitioned by a partition (6) , and a gas generating agent (12) and a filter are provided on an outer peripheral portion.
(13 to 15) and charge (1 ) above the center
In 6) the rake <br/> blanking attached to the squib holder in its lower (30) comprising comprises a gas generator (1), suited to transfer charge (16) from the upper surface (41a) of said squib
An annular member (32) having an opening is provided on the upper surface of the squib.
When the squib fires,
A ring-shaped destruction portion (45) is formed
Gas generator, characterized in that that. 2. A squib holder (31) is provided from above.
It has a hole (31a) extending downward, and a squib is provided in the hole.
(30) is fitted, and the lower surface of the squib is
The upper surface is held by the sealing material (33).
(31a) the annular member (3
Gas generation according to claim 1, which is retained by 2).
vessel. 3. A squib holder (52) for generating gas.
A circle formed integrally with the container body (55) and extending inward.
A tubular copper part (52c) and an opening (5
2a) having an annular member portion (52b).
The squib holder and the annular member are integrally formed.
And the upper surface of the squib is connected to the annular member (5).
2b) cylindrical body of the squib holder so as to abut against
The gas according to claim 1, wherein the gas is inserted and fixed in (52c).
Generator. 4. The squib comprises a tube (41) and a
A tubular sheath (48) inserted therein;
And an ignition charge (42) filled in the container.
The ring-shaped broken portion (45) on the upper surface of the eve is the sheath
(48) The diameter of the annular member is smaller than the inner diameter of (48).
(32a, 52a) is larger than the inner diameter of the sheath (48).
The gas generation according to claim 1, 2, or 3, wherein the gas generation has a large diameter.
vessel.